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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d090a5c389c8b82564a95a096b2b0a322b2cac9a79e1bef1cf8eb86a28bf55' 
  AND token = '8u97KdSEthmCOY8ezPctfXC+6ZrZFsii41d8KiSkV9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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