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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7fdb1e288135ab915f7b68ebdc5452c1d8c953093cfefcf78e803fa33675161' 
  AND token = 'uCTaknk74Q7cDWGtJaRT3MA3uPduAos5pOOZVUZ1540=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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