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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd6a361371712a1246fbae5c70b2440888d1a0226d7fd51b191ed3e16aaae785' 
  AND token = 'rFyufthemzPirsiJ38ApTl19liLaNU4D3CSixootviI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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