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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cf88319fed80f2d690ba073c3757e1e770049bad6e59d030bac46807fcc3cd2' 
  AND token = '8H06zqCWQE7bNU6Npetc+j8Vhj/VN7TS7DHOyHcaD+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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