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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e0c94ce58c45d6eceddd68bb9239e0aafe4a17cb25f70dfa4f3c03d56d49ad' 
  AND token = 'LkaNiyJGqkQ5voBl+ueWoeT6b9yEOWnZiGbvO2jAIQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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