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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d9aec4b671d3e527080adeebac22d06f8dd36ea4f516f0ba13a2ab5ecde946' 
  AND token = 'NszSwTKh4XGIilRNVx2mT0qrLGAG+4cTtAeK84lBBhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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