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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '658aedef062b3d3ceb3e060a32b403f3308b0764ef834a187d87f8b86093ac5e' 
  AND token = 'LG/YtncJ7Wo1I3fMm3BcLtC3YPPiuvLxWp+dtAkI/Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}