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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edaef9c6b8fab203b7425b43913b0c9661d10835f9668e8400d146f4979aebbc' 
  AND token = 'nHMPlAJGw7F1HLin5qb9t6Ho7b6n06cG+f/NtH1HFy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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