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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1988fd59fb9a659669d82b8d8002334b4aaeb02a592e29a026b46c6a97ad6d5d' 
  AND token = '+R4lgQKYMwVZ4jbtd6uWuVHUEGmXskpPgrratBstC9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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