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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c5e8f1e32df4e1be6be35d83632793216bbca11b22beecd575a3377cddae82' 
  AND token = 'tPumZulDux8Zkm0yC0rwN8n7bxEBZ2gzuGGqhAABJtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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