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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd5d36fe20dd77fed99c0416a5ddcafaf4bc1864325d18cd39b2e6d30697a03' 
  AND token = 'q4SKH0SPgN9q69qtRa8/RmTbKBF2QNI4TJb15O0MjOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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