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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97b977de3ae290176f90db4a818f0cfd3a5d163ea53e1844b3c8a783e107755f' 
  AND token = 'TiLrY6PHgq/bD+DaWIy9+waq1Ml2+3kvjIrxmSc1oqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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