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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5cf056f4b329808e959a2dd8f4a0ee2240d225651cf59b5451a473123a4c1f1' 
  AND token = 'GBlbXfnWn95/HVmakFATsRiBPCKbIBeLHOQvJjs4j24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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