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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56331abdec7b7def7926ca825186f15a02f3663ff824b3fc5d4097c1e2aaabf0' 
  AND token = '48p+OCA9hPv42xjNw3LivKe0aW/dsyfHglPg35QL6eg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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