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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c2e76abe7d4ff6ddd3a7c9c3d17a9a2982c45b7a4a6de1e056be71f4903ab2a' 
  AND token = 'MGCYDk9D0qapvqQkDEY/s0FMpJEaAt+zJ6p8HcALp6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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