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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8b2ef32e333e1451f14fb0d2cb58afac6307a0b1ed00eade86580f7e1bb2f8' 
  AND token = 'Rn+o88lqYmV2o2wjv47dH2awxiSOiT/VAMKnBrNu1qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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