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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760213974ab7d998154b51716d9e8306847c8d1d67e14c1d78c035a23ad0e96e' 
  AND token = 'gBNGkEVpZycHzew7Px9ogMTBRQMKp/G49X+60GjDkQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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