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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4026362821708634f1da3ccaf4828e2a637e124f4ea6ceac321f4181e3a4ab4e' 
  AND token = 'MtBKBeJnyNk10bKy5Mhjs82iYTwHiZ+Dtz8hMVINwX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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