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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31f8b6e26db1d3bf3be97a5c2535b43027d2cb5a4cc93da5c64bcb201be2bb1' 
  AND token = 'DGrYElAXSf++aPUW0O+OzOKDqXzlkBAdXjGFXFkdRDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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