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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa54e132e5daac95391b93b1dfcd769bd3d3fbcb81718f1cb1fa0c3311a73fe2' 
  AND token = 'olz50hRD6kKj8lHKv8rfXlbs3OLs3m69HO3guCmr0sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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