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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74ffdd9ae921242cf0e9528c6b5c59b12c7f3ff694e5e21ad3434698522c9792' 
  AND token = 'n/Oj0X0Av3dbSUVxijLaAqrK9tE5nMEFWr6byP4KLvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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