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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4720e6af0adc603801ae225365b0175db49dbb3e6d021f9267ce9c26740eb94b' 
  AND token = 'Aq8tGhUMyH1MGng6dGlYfJ3cfUIBAyg1J0Mloo7qcCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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