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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1da16b83479fc289cbddbe07249101d1955d63cc073ca0c0ceac234bae51681b' 
  AND token = 'nmva0l0zSZdPu7fGSWYTPN/CX+XOSs5dZW2PHF86B7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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