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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd353d135259c52d5d34471959127e1ae2d8b95c01f05928466341b89f172d16' 
  AND token = 'ARWG4LzpyVaOFl+63insjRUlIc4dOx5sUEfz68H71Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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