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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c970375ac0b69a431dc303d6d0082fade07a05c97abfdcd69718a068bf3840' 
  AND token = 'wXEAMZhnYtkOaRb/QwItqS9swrohGYwSP3rb1Offhmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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