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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d121c7bb4104f9da926d0d58bf74b2b83fc4c3532830047681367378d351744' 
  AND token = 'qnorSSWg80d0ebBss5R0Y5QV0Ocpw69Au1nR3U5/vYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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