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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c784254c2181f52ef85034f08147fd92e909baafaf036fec77e087103fe5d0d' 
  AND token = 'F1125fPBNkIMNYZ898pBuTowK5OH45EexF2qYwcZbrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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