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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2e8f8625328b5ef8d5b02c9059bb545a51ea9f1f0dc55bf102794c987d2eb6' 
  AND token = 'g/JzyIBOUE1D3FTFVjTvj9mu8Rh7ybQE2OkJ9xK3W04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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