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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6e1d730fe8acf10b7d91507239d413e1ffe109def21f3c07c3a7e1ae0f0a7f' 
  AND token = 'J5iadQwx9mocXESAri99EobisS3jnYJTgeEPZHD3z6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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