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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '884e07ce9ca4b70a535b2c1513ee889cd4cd304fed98fbd9d0a2a8c609ca87e8' 
  AND token = 'Oo1jBqONsCpsv8V/eMbywq8MPYOkaMcLc8ZaDtKINZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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