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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c904f969a7f1bf35482c9f5f5157c570de3c53c930b0fb4845ef13bed9c90d85' 
  AND token = 'm3fPTSGbVpWw+WckqkNDWWSUnGkH+x6hkLLqe1tKx+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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