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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc1fa53982982fb44e6016ae7e58b417f2ed5c2c95ed4ed231433cb39297459' 
  AND token = '10L5aR2gLVbNKHmNGyXMG6d1aVjTKxa+VclTeG9EZF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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