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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '961d168fcb9498716effd0036a7737ca3c9d92089541b7b7959d36905204da48' 
  AND token = '6sOPQEdLzkDHHj77nDHGCp87q3w3+OZRYgfyRco26lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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