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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a13d074953de5cd6d202c4e55c0e18bd859f16c609421208fa09f0d9b95f8dbb' 
  AND token = '+g+cR8pe2+N+u56k6ZRsmajJUtyztLUuV1YZq7T7ur8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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