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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeaa55327b0cc8e204cc8d70c0768cc49b409ecc4b19b7f89b91950114f70ef8' 
  AND token = 'i5CKoMs07511yaMS6lmw5qPjr7NyRgR70awW3Lm+k+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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