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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c51c312e97bcfacbb90c7697239cbc4ce57d8d8792f29dd752abfc7938cad6fd' 
  AND token = 'W8deq1a6b50zHKveKEM+4h7RTKM/GAYAyjZROZ//TVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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