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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634b8018feb8199590a045d7fce42324d57d355f38c46f1a2d3ff7735d723239' 
  AND token = '6mpewQ2rXyFeMKdP0d9fwdPM2B+PLOjcerVnIrdJEI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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