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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44694768b4fe14d95d0110445aa5bd7ec04a63fb4f50519ce2748027cbc2778' 
  AND token = '8BNldCIHULOSTELYjfm5ZMRyvC38EwHpksPNh+Jkv14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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