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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dc1996b927f266bb6f4310e9ba52ae1073d86b90843fb29d4396e74c9af33b' 
  AND token = 'ztnKO53DWs94cCEx0xQ8whKp7PprwFoR68BD/RFeXbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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