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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7ecace8837302f9f3684f9655aa41000f082efe856e7bf4b7c3afa62daf230d' 
  AND token = 'OkcVkV5NKGuvGemhjmfniEFP+QJZ2/mFdEtUCdMA7M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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