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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '232aec696c9e3bf9b4231942bb038aeb632043686481ddc0b377464cb664db58' 
  AND token = 'oCZ6ex2CmHCr1wtcvYz/pt60ldP/6twZyaDN9NKKEPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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