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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb8f9be543f79843fa5f0aa6bf7f93523a0f37fdd5613b23e7bdc67b90b3a032' 
  AND token = 'YBVtAZ1NI4IcGDq0oBwD7GOiIB75Krg9MY24wtZ3CYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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