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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3438550e8fad2f1ecccf249bec9e0049911a6f292d736d658c5ed2c4e402ed' 
  AND token = 'QvwISsb9wLUELhJRRZn74Ie6I4QvfpMNrCHd4NWh+RQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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