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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38efaf46446083ee503129c69b07ce3ae7dfcd63f528a9fe60147fe2a0d35dca' 
  AND token = 'rIleckgOOKMWt4U/48H0sjYSYusKtiMNalaY1Ix/UOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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