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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09f5aa80f6c072f313871c4307a8d8c3deb3eda487468db7026bd8f0aa3501b' 
  AND token = 'poSgudvjJRPSk531ljjnfmsvXCY2FWVNvej5Cb8XEeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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