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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7095fb28f7e2f48b6a07ef41ac6b3577a793293765813b8c1bd092738ffa67d' 
  AND token = '4K1RXfgPxPdbXzOsbbppjI0lEqTQE9RRPU9uAH76X3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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