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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aff58308666abb2cc733c8c31c0892a82db7a8df0a2e47d221815db644aedfb2' 
  AND token = 'AmNYg4RVgvIewsBZIexAY5Hg74YTDXXIsvIGWan9Zic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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