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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f2a4eb505ec4f1770bbd1517170d9d043948ddf9fe1e529ae80acd52d97dd0' 
  AND token = 'K/ANYp4eSPUpyuQ6w6dTRTi4aC+PIhKRg2TQJmldvPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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