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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4217a536c12f9bd90c74fcaad1f6f37b175462811b14e04dfecb6f0661af82fb' 
  AND token = '1U4Jlhbb2zNOjJO6RAL0lXmwZINEHngxFSN6WUVnZos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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