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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7177fadd2d6094d35e1e431e0b73df14d80f7520d5c9468bd2e5881d6aa99c6' 
  AND token = 'tz+ZTM3WPYDSOfgmpRtwvswIbynouWJgJzk6cAYTJ2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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