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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d0291a215dc9170006b399e82577cd91937d4fc858a9a5632aa8ef5c2a64857' 
  AND token = 'RWkySlN16sCGhjq3y1MCU3dMGkBc5zaSg0blrOCSj3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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