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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c853547d5e6d1b68e91b497407d73ef03d87713f623ae37d89e561a7298c4f8' 
  AND token = 'zspxMmC6SF3UtqzsIVYpsiY42KPdBq3n8zJRlzLaHC4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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