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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e85c7ece2b02090dec8eac7501cd9ba7117cd4b57ce6461bf6d72a324ed208' 
  AND token = 'mYLUKV26rwrbrC0AW0m6So8iNALProx1LcNSmxSvRGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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