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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b801bdd9f4dd913ef9f8f7ca4a1d05ea06a973a1c470ffe0fe263d00d8eb7630' 
  AND token = '6FkvZExHN3Z4gndMEZb1ET6l5+SPzqCDtAODdHYAcY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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