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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e8cfb3c48533aefc6f38ecc322004984bbd4b5d4671df2a3906be125947377' 
  AND token = 'mCbtJG9sbC/bfXG6tfmR4vUZtS8mm/KlotOFxVwsLwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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