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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42ec684d2068b1dd19ac17d1a63c7f875c69fdafa77fd18828843e1b1935a7fa' 
  AND token = 'wOCLBceksUpjXSmXQw/I3zMcpBLEpZRGPZH3RGrD1k0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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