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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eec458784f4c6b319d69081a8ce3a446c215989cc997c4b87ac2a8066773e3d' 
  AND token = 'zG6SI4vf2VBA5Ze/J94j+YkNXK51+tUiMzRIo98GIdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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