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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e49e15d9d94ad74232df8fcb9b78e211b0ef22273106ebc1660645750948327' 
  AND token = '8ZasS8K4cZ/vgUofWfclIW8PEYOm/i83XDOzbqWZe1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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