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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fd580ff2a0d705601dbb822f121af6268ca36ab5e8219d233d8c6b29986924' 
  AND token = 'MaY1ZX0g/Y2Tmqo7LGLelcSrMl5mP1u3n43egS4tuJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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