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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b717ff9c5131579b108c2546adbc61fd91326d5bb48c9940332a98574460654' 
  AND token = '4d3dO4c+dSPxRu6ggfJpFihvvSM6g0UiWo8xiezxvfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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