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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd650534b77a2752d6b0fc1c17f074c8bb5a6bb3e754f3f1b2867bb03d8295b' 
  AND token = 'z0ABPZfDzkRpCW+hVeDIIv+gPU3/vRcN5h56WAxFtkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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