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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e373847c2187917d7628245c8b3b5e563203507f8ede623b60bec32d94ac69' 
  AND token = 'ffsb6xbKAufKhhxh08XZWHExDFz/gg5Rv6D/xstDMqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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