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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56524d4cdffdd49f56cfa4cf3f74c1a420c726d7f0a12a84c9becd034bfa2f1e' 
  AND token = 'ovCVEGKjQ5QKOGn4QwF9OAmkbT6qzFUpr2+dakFAYFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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