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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead37d5f9e9078cb95be1ad832eb10aaacddce7ba13c6d94e618d44b9dc7b85b' 
  AND token = '/vcHmezQjZHBkhBQrAcFguyVuh4nAx2bC6Akobqk50c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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